Level, Distribution, And Source Resolution Of Persistent Organic Pollutants (POPs) In Typical Area In Zhejiang

A rapid,inexpensive and accurate analysis method for polychlorinateddibenzo-p-dioxins (PCDDs)and dibenzofurans (PCDFs),dioxin-like polychlorinatedbiphenyls (dioxin-like PCBs),polycyclic aromatic hydrocarbons (PAHs)inenvironmental matrix was evaluated in this research with gas chromatography / lowresolution mass spectrometry (HRGC/LRMS)at first.With this method,thedistribution,pollution and source analysis of the Persistent Organic Pollutants (POPs)in fule gas of pollution source,ambient air,soil and sediment in typical area ofZhejiang Province in China was researched.The main conclusions and innovationwere below:1)The influence of the PCDD/Fs emission from a large-scale municipal solidwaste incinerator (MSWI)was evaluated by the research of the relativity among theemission gas,the ambient air and soil.It found that the most abundant congener ofPCDD/Fs in different mateixes was 2,3,4,7,8-PentaCDF,with 52.9±1.4%,50.5±2.8%,and 77.2% respectivally.Through the comparativity of the profile of different matrix,the correlation of the PCDD/Fs was very good,which means that the PCDD/Fs inambient air and soil was come from the emission of the MSWI.2)According to the variance of the content of oxygen,carbon oxygen,temperature,gas flow rate and the observation of the furnace of the rural solid wasteincinerator (RSWI),the burning of the solid waste could be divided into four steps(baking step,buring step,post-burning step and ember step),with a level of PCDD/Fsemission of 235,27.6,44.9 and 69.2 ng I-TEQ/m³ correspondingly.The mostabundant congener of PCDD/Fs was 2,3,4,7,8-PentaCDF,with 53.8%±14.0% inemission gas and the residua.The levels of the PCDD/Fs in soil samples around theemission source was 4.64 pg I-TEQ/g which was almost ten times of backgroundsample (0.537 pg I-TEQ/g),and the concentrations of the pine needle and the pinestem closed the RSWI were 0.847,0.173 pg I-TEQ/g respectively.Research thecorrelation of the PCDD/Fs profile in different matrix,the correlativity of the fule gas,residual of the incineration,and the plant samples was good which means that thesource of the PCDD/Fs in plant was come from the emission of the RSWI.Although the correlation of the PCDD/Fs in soil samples and other samples was not very good,the influence of the PCDD/Fs in RSWI to soil samples was still exist.3)The distribution and concentrations of PCDD/Fs and dioxin-like PCBs in atypical area of China was evaluated by analysis of soil and sediment samples whichcollected from a typical disassembling electronic solid waste area of Zhejiang Provine.The range of WHO-TEQ values for the PCDD/Fs and dioxin-like PCBs in 17 soilsamples representing the background investigation in the study area was 0.017-5.04pg/g dw,which means that the levels of dioxin pollution over the major part of thisdistrict were low.However,the WHO-TEQ values for PCDD/Fs and dioxin-likePCBs in soil samples to the leeward of a known pollution source was much higherthan that of the background investigation (6.52-16.7 pg/g dw),and the levels ofsediment samples downstream of this area was in the range 2.25-34.6 pg/g dw.Theconcentration levels in soil and sediment decreased with increasing distance from thepolluted area.The correlation of PCDD/Fs and dioxin-like PCBs in soil and sedimentindicated that the major source of PCDD/Fs and dioxin-like PCBs in the sedimentcame from soil loss.4)The distribution,level,source resolution of Polycyclic AromaticHydrocarbons (PAHs)in PM_2.5with chemical mass balance (CMB)were researchedin ambient air in Hangzhou city.Research found:1)the pollution of PM_2.5in ambientair was relative serious in Hangzhou.2)the levels of PAHs in PM_2.5in Spring,Summer and Autumn season were relative gentle,and the results in winter wasrelative serious.3)according to the source resolution with CMB with several labeledcompounds,including PAHs,sulfur,chloroine and other selected materials,thecontribution to PM_2.5in ambient air was 39.2%,19.1%,17.2%,11.1%,10.0%,and2.7% to coal burning dust,soil,steel dust,vehicle dust,dust and oil burningrespectively;4)the contribution to PAHs in ambient air was 43%,21%,21% 9%,and6% in vehicle,soil,coal burning,steel,and dust respectively.